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/* This file is part of GNU Dico.
Copyright (C) 2008-2024 Sergey Poznyakoff
GNU Dico is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Dico is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Dico. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <dico.h>
#include <appi18n.h>
#include <wordsplit.h>
#include <errno.h>
#include <security/pam_appl.h>
static char *service = "dicod";
#define COPY_STRING(s) (s) ? strdup(s) : NULL
#define overwrite_and_free(ptr) \
do { \
char *s = ptr; \
while (*s) \
*s++ = 0; \
} while (0)
#ifndef PAM_AUTHTOK_RECOVER_ERR
# define PAM_AUTHTOK_RECOVER_ERR PAM_CONV_ERR
#endif
struct pam_cred {
const char *user;
const char *pass;
};
static int
_dico_conv(int num_msg, const struct pam_message **msg,
struct pam_response **resp, void *appdata_ptr)
{
int status = PAM_SUCCESS;
int i;
struct pam_response *reply = NULL;
struct pam_cred *cred = appdata_ptr;
reply = calloc(num_msg, sizeof(*reply));
if (!reply)
return PAM_CONV_ERR;
for (i = 0; i < num_msg && status == PAM_SUCCESS; i++) {
switch (msg[i]->msg_style) {
case PAM_PROMPT_ECHO_ON:
reply[i].resp_retcode = PAM_SUCCESS;
reply[i].resp = COPY_STRING(cred->user);
/* PAM frees resp */
break;
case PAM_PROMPT_ECHO_OFF:
if (cred->pass) {
reply[i].resp_retcode = PAM_SUCCESS;
reply[i].resp = COPY_STRING(cred->pass);
/* PAM frees resp */
} else
status = PAM_AUTHTOK_RECOVER_ERR;
break;
case PAM_TEXT_INFO:
case PAM_ERROR_MSG:
reply[i].resp_retcode = PAM_SUCCESS;
reply[i].resp = NULL;
break;
default:
status = PAM_CONV_ERR;
}
}
if (status != PAM_SUCCESS) {
for (i = 0; i < num_msg; i++)
if (reply[i].resp) {
switch (msg[i]->msg_style) {
case PAM_PROMPT_ECHO_ON:
case PAM_PROMPT_ECHO_OFF:
overwrite_and_free(reply[i].resp);
break;
case PAM_ERROR_MSG:
case PAM_TEXT_INFO:
free(reply[i].resp);
}
}
free(reply);
} else
*resp = reply;
return status;
}
static int
db_check_pass(void *handle, const char *pwres,
const char *key, const char *pass)
{
pam_handle_t *pamh;
int pamerror;
struct pam_cred cred = { key, pass };
struct pam_conv _dico_pam_conv = { &_dico_conv, &cred };
#define PAM_ERROR if (pamerror != PAM_SUCCESS) break;
do {
pamerror = pam_start(pwres ? pwres : service, key,
&_dico_pam_conv, &pamh);
PAM_ERROR;
pamerror = pam_authenticate(pamh, 0);
PAM_ERROR;
pamerror = pam_acct_mgmt(pamh, 0);
PAM_ERROR;
pamerror = pam_setcred(pamh, PAM_ESTABLISH_CRED);
} while(0);
pam_end(pamh, PAM_SUCCESS);
switch (pamerror) {
case PAM_SUCCESS:
return 0;
case PAM_AUTH_ERR:
return 1;
}
dico_log(L_ERR, 0, "PAM authentication error");
return 1;
}
static int
db_get_groups(void *handle, const char *qgr, const char *key,
dico_list_t *pgroups)
{
*pgroups = NULL;
return 0;
}
static struct dico_udb_def pam_udb_def = {
"pam",
NULL,
NULL,
NULL,
db_get_groups,
db_check_pass
};
static int
dico_pam_init(int argc, char **argv)
{
struct dico_option init_option[] = {
{ DICO_OPTSTR(service), dico_opt_string, &service },
{ NULL }
};
if (dico_parseopt(init_option, argc, argv, 0, NULL))
return -1;
return dico_udb_define(&pam_udb_def);
}
struct dico_database_module DICO_EXPORT(pam, module) = {
DICO_MODULE_VERSION,
DICO_CAPA_NODB,
dico_pam_init,
};
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